Permit resolving retired package versions, but prefer non-retired and emit warning

[d2718]

To reproduce:

Add a retired package to your gleam.toml, for example:

gleam_pgo = "0.14.0"

And then try to build (or check) your package:

gleam check

Expected:

My package to build/check successfully.

Experienced:

Failure of dependency resolution.

gleam check
  Resolving versions
error: Dependency resolution failed

An error occurred while determining what dependency packages and
versions should be downloaded.
The error from the version resolver library was:

Unable to find compatible versions for the version constraints in your
gleam.toml. The conflicting packages are:

- py_package
- gleam_pgo

Environment:

Gleam 1.6.1 (installed from GitHub releases page)
Debian 12 under WSL2

spammy GLEAM_LOG=trace dump

dan@IPRC-PF4SK9MP:~/dev/aloy/server$ GLEAM_LOG=trace gleam check
DEBUG download_deps: locking_build_directory path="/home/dan/dev/aloy/server/build/packages"
TRACE download_deps: reading_file path="/home/dan/dev/aloy/server/gleam.toml"
DEBUG download_deps: manifest_not_present
  Resolving versions
TRACE download_deps: reading_file path="/home/dan/dev/aloy/walt/gleam.toml"
TRACE download_deps: reading_file path="/home/dan/dev/aloy/shared/gleam.toml"
 INFO download_deps: resolving_versions
DEBUG download_deps: looking_up_hex_package package="mist"
TRACE download_deps: checkout waiting for idle connection: ("https", repo.hex.pm)
DEBUG download_deps: starting new connection: https://repo.hex.pm/
TRACE download_deps: Http::connect; scheme=Some("https"), host=Some("repo.hex.pm"), port=None
DEBUG resolving host="repo.hex.pm"
DEBUG download_deps: connecting to 151.101.130.2:443
DEBUG download_deps: connected to 151.101.130.2:443
TRACE download_deps: http1 handshake complete, spawning background dispatcher task
TRACE download_deps: checkout dropped for ("https", repo.hex.pm)
TRACE put; add idle connection for ("https", repo.hex.pm)
DEBUG pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="gleam_stdlib"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE put; add idle connection for ("https", repo.hex.pm)
DEBUG pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="argus"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE download_deps: put; add idle connection for ("https", repo.hex.pm)
DEBUG download_deps: pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="gleam_erlang"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE put; add idle connection for ("https", repo.hex.pm)
DEBUG pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="stdin"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE put; add idle connection for ("https", repo.hex.pm)
DEBUG pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="envoy"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE put; add idle connection for ("https", repo.hex.pm)
DEBUG pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="wisp"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE put; add idle connection for ("https", repo.hex.pm)
DEBUG pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="gleam_http"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE download_deps: put; add idle connection for ("https", repo.hex.pm)
DEBUG download_deps: pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="gleeunit"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE put; add idle connection for ("https", repo.hex.pm)
DEBUG pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="simplifile"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE put; add idle connection for ("https", repo.hex.pm)
DEBUG pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="gleam_pgo"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE put; add idle connection for ("https", repo.hex.pm)
DEBUG pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="filepath"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE download_deps: put; add idle connection for ("https", repo.hex.pm)
DEBUG download_deps: pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="marceau"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE download_deps: put; add idle connection for ("https", repo.hex.pm)
DEBUG download_deps: pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="gleam_json"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE download_deps: put; add idle connection for ("https", repo.hex.pm)
DEBUG download_deps: pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="argv"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE download_deps: put; add idle connection for ("https", repo.hex.pm)
DEBUG download_deps: pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="birl"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE put; add idle connection for ("https", repo.hex.pm)
DEBUG pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="logging"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE put; add idle connection for ("https", repo.hex.pm)
DEBUG pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="glisten"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE put; add idle connection for ("https", repo.hex.pm)
DEBUG pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="gramps"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE put; add idle connection for ("https", repo.hex.pm)
DEBUG pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="hpack_erl"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE put; add idle connection for ("https", repo.hex.pm)
DEBUG pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="gleam_otp"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE put; add idle connection for ("https", repo.hex.pm)
DEBUG pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="jargon"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE put; add idle connection for ("https", repo.hex.pm)
DEBUG pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="telemetry"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE put; add idle connection for ("https", repo.hex.pm)
DEBUG pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="exception"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE download_deps: put; add idle connection for ("https", repo.hex.pm)
DEBUG download_deps: pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="gleam_crypto"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE put; add idle connection for ("https", repo.hex.pm)
DEBUG pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="directories"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE put; add idle connection for ("https", repo.hex.pm)
DEBUG pooling idle connection for ("https", repo.hex.pm)
DEBUG download_deps: looking_up_hex_package package="ranger"
TRACE download_deps: take? ("https", repo.hex.pm): expiration = Some(90s)
DEBUG download_deps: reuse idle connection for ("https", repo.hex.pm)
TRACE put; add idle connection for ("https", repo.hex.pm)
DEBUG pooling idle connection for ("https", repo.hex.pm)
ERROR Failed error=DependencyResolutionFailed("Unable to find compatible versions for the version constraints in your\ngleam.toml. The conflicting packages are:\n\n- aloy\n- gleam_pgo\n")
error: Dependency resolution failed
An error occurred while determining what dependency packages and

versions should be downloaded.

The error from the version resolver library was:
Unable to find compatible versions for the version constraints in your

gleam.toml. The conflicting packages are:

aloy
gleam_pgo

[lpil]

Thank you